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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9588d1ed1a8b44417ecc6048ef55adf7077f9b5ab295e7ae33d436d39cf3f0f9' 
  AND token = 'o+v55/8NefFK7JGE1UXXsX5hk4y+pJgnDBnk4VSEpfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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