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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb73e43b7a61f58e683f481dd2c6ab52b0c10d2c5ab53740259349e472ec6558' 
  AND token = 'fbNlRG6sopVRdDQjeBAp9vz+GnMz2iu9dn1A+Ps759c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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