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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e64057a9b30fb83dee97e8b5fc30b92b7a817bf47fb524dad5e4d28cff9cd0' 
  AND token = 'NzWi154x2IvtwIXrOA4qk9vFAV1oQIJiBfkx2uUf9IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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