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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f800de3030edeb3a6a5f2e0f2ebaa384f0377f7417ed90bbc808044ee0444bf' 
  AND token = 'OeBsraIuqw8cZJcl/BZbxOY/OhPiICYIuFEEA19c+ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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