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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9c2f454c39975097d01c96f691a76ec147145cdb713cd4f667eca71de64ee3' 
  AND token = '0bCTzpJxRjQy+vsbHi9EAOeVy6X1Ozh+ka3l0OxhVSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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