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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bd511a74e6672f1b66ad29dd22531f15603f0aa97cd0d3e62a764340eac0ad' 
  AND token = 'qY5C5KpHPm7MIw8V+XY1PZyLidYBYl2iwIw9ntnVtag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}