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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e45795e837a14eff1fd49dd8400d72416b93d2f00c5d0ecc979c4ef80538b5a' 
  AND token = '9lbRktdeU8GuM8amdZerKNb9evk7Mq4gJ3cH6XfdmjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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