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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52a17b1c47c969f91d3af30cd89355c774ce0a0e56912bf2d398c7bc313a240' 
  AND token = 'Vo4pG1IvXAeXwMiPY+PshJ1+P+nf3YgfMd+P3ot+bE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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