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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadd0e644a955cceb941ef6e70a4b893cfa53511df89e87317ea2f7f9e106f78' 
  AND token = 'zSZ4kOfNxWVYL/P5Yx5/exyBWVemgd4Ag/SBJgu5ozE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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