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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbc70cdf918573c0e02b2bf7bfbd3a355aca1b75b04dc1a173eea77d104e211' 
  AND token = '+AbmffpSRaBj6xHnEhyvwn4Ar7W7Ovn5wFmI+3kaZnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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