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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b357f76aba2817c8b31dc442681b0e88497d7d964812dd3d4b1877f699c8ad' 
  AND token = '+OZjHIw4PT4uEPqu9Q9AFXZZwxKbKDwETKB60u9Tht0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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